The lead weights will help you roll through the scales without any worries.  They are dipped in white vinyl and the mounting holes are all pre drilled. They are available in the following weights:

• 2 lbs (3 3/4" x 1 5/8" x 2")
• 4 lbs (3 3/4" x 2 3/4" x 2")
• 6 lbs (3 3/4" x 4 1/4" x 2")
• 8 lbs (3 3/4" x 5 1/4" x 2")
• 10 lbs (3 3/4" x 6 1/4" x 2") 

The mounting hardware is included.